RubyMine 2017.3 Help

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Extract Variable

Basics

The Extract Variable refactoring puts the result of the selected expression into a variable. It declares a new variable and uses the expression as an initializer. The original expression is replaced with the new variable (see the examples below).

Extracting variable in-place

To extract a variable using in-place refactoring, follow these steps

In the editor, select the expression to be replaced with a variable. You can do that yourself or use the smart expression selection feature to let RubyMine help you. So, do one of the following:

Highlight the expression. Then choose Refactor | Extract | Variable on the main menu or on the context menu.

Alternatively, pressCtrl+Alt+V.

Place the cursor before or within the expression. Choose Refactor | Extract Variable on the main menu or on the context menu. or press Ctrl+Alt+V.

If more than one occurrence of the selected expression is found, select Replace this occurrence only or Replace all occurrences in the Multiple occurrences found pop-up menu. To select the required option, just click it. Alternatively, use the Up and Down arrow keys to navigate to the option of interest, and press Enter to select it.

Specify the name of the variable. Do one of the following:

Select one of the suggested names from the pop-up list. To do that, double-click the suitable name. Alternatively, use the Up and Down arrow keys to navigate to the name of interest, and Enter to select it.

Edit the name by typing. The name is shown in the box with red borders and changes as you type. When finished, pressEnter.

The Expressions pop-up menu contains all the expressions appropriate for the current cursor position in the editor.

When you navigate through the suggested expressions in the pop-up, the code highlighting in the editor changes accordingly.

Extracting variable with a dialog

To extract a variable using the dialog box

If the Enable in place refactorings check box is cleared in the Editor settings, the Extract Variable refactoring is performed by means of the Extract Variable Dialog dialog box

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In the editor, select the expression to be replaced with a variable. You can do that yourself or use the smart expression selection feature to let RubyMine help you. So, do one of the following:

Highlight the expression. Then choose Refactor | Extract | Variable on the main menu or on the context menu.

Alternatively, pressCtrl+Alt+V.

Place the cursor before or within the expression. Choose Refactor | Extract Variable on the main menu or on the context menu. or press Ctrl+Alt+V.

In the Expressions pop-up menu, select the expression. To do that, click the required expression. Alternatively, use the Up and Down arrow keys to navigate to the expression of interest, and then press Enter to select it.

Specify the variable name next to Name field. You can select one of the suggested names from the list or type the name in the Name box.

If more than one occurrence of the selected expression is found, you can select to replace all the found occurrences by selecting the corresponding checkbox. If you want to replace only the current occurrence, clear the Replace all occurrences checkbox.

ClickOK.

The Expressions pop-up menu contains all the expressions appropriate for the current cursor position in the editor.

When you navigate through the suggested expressions in the pop-up, the code highlighting in the editor changes accordingly.